((Rebecca))
When I was in college, I got very sick at the end of every semester. After several years, I just recognized that's how my body works. It isn't fun (at all!), but that's just the way that things worked for me.
My point is: You may be that same type of person. Rather than assuming that you simply have no interest in school at this point of your life. Something to think about. Don't kick yourself for not being more "into" school. It sounds as though you're wondering why things don't feel awesome. School isn't always awesome. Some pre-requisites suck and are BORING! A lot of times, we have lots of stuff happening in our lives (all at once) and it becomes overwhelming.
I didn't mean to go off on a tangent there, just don't want you to kick yourself any more. You deserve a break

! Best wishes to you ~ take care!